The requirement for filter efficiency measurement (contamination control) has been outlined for years by ASHRAE 52.1 as a classical gravimetric method. Since the concentration of smaller particulate in ambient air is dramatically increasing, new methods need to be developed for air cleaning devices to study the removal efficiency by particle size. ...

When used in conjunction, acoustic and electro-acoustic techniques have significant advantages for characterizing particle distribution and zeta potential. As such, an optimum ultrasound based technique should combine both acoustic and electro-acoustic spectroscopy together in one instrument. The Acoustic & Electro-acoustic ...

The welas digital 1000 is a flexible, powerful and economical light-scattering spectrometer system, which determines particle concentration and size precisely and reliably. With the welas digital 1000, particle sizes above 120 nm can be reliably measured, as the special high power xenon high pressure lamp with very high light intensity and the ...

Scattered-light aerosol spectrometer system for process measurement technology and monitoring applications. Promo 2000 is a light-scattering aerosol spectrometer system for particle size analysis and concentration determination that can be equipped with all welas sensors. On Promo 2000, the welas sensors equipped with different measurement ...

Grimm is a leading engineering technology provider undertaking research and design and production of different aerosol spectrometers for research as well as indoor and outdoor air quality monitoring. This powerful instrument gives the user the ability to continuously measure in real time particles in 31 different size channels and present the data ...

Scattered-light aerosol spectrometer system for process measurement technology and monitoring applications with two sensors. The Promo is a light-scattering aerosol spectrometer system for particle size analysis and concentration determination that can be equipped with all welas sensors. On Promo 3000, the welas sensors equipped with different ...

The Aerosol Particle Size Spectrometer LAP 322 provides the determination of aerosol particle size distributions (0.2-40µm) and particle concentrations. It is based on optical single-particle measurements by means of 90° scattered light measurement. By dint of high number of provided particle size classes a high particle sizing ...

Aerosol spectrometer with two aerosol sensors, highest particle size resolution, measuring range from 200 nm to 40 µm. The welas digital 3000 is a flexible, powerful and economical light-scattering spectrometer system with two aerosol sensors, which determines particle concentration and size precisely and reliably. On the new welas digital ...